The presence of crosslinks hardens the overall structure. true or false Answer: c Explaination: (c) It … It can cure because of heating, owing to a chemical reaction, or following irradiation like processing by means of electronic beams. ? TRUE ? Answer. 7. B false. ? They are classified either as thermosetting polymers or thermoplastic polymers. FALSE; HDPE is a tough plastic used for making toys. (c) Both Assertion and Reason are false. 6 Which of the following is the thermoplastic material? [CBSE AIPMT 2012] A. Dacron. Reason (R): Mechanical and aesthetic properties of cellulose can be improved by acetylation. Nylon is a thermoplastic polymer. Note that the monomeric units that make up the polymer are not identical with the starting components. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. Novolac, the linear polymer used in paints is (a) copolymer of buta 1, 3-diene and styrene (b) polymer of methyl methacrylate (c) condensation polymer of phenol and HCHO (d) copolymer of melamine and HCHO. ... like molecule consisting of a large number of simple small molecules joined to each other by chemical bonds is called polymer. 1) Answer True or False for the following questions. B false. Thermoplastic softens on heating and then can be moulded into various shapes. D. Glyptal. True. 6) Which of the following is commonly used in schools for vacuum forming? TRUE ? Before the thermosetting plastic cures it is malleable and can be moulded into different forms, or used as an adhesive. 17. A. True. Play this game to review English. FALSE; Epoxy resin is a thermoplastic? Answer. FALSE; Plastic is suitable for building large and heavy structures. As with most rubbers, neoprene is an elastomer. Examples: Nylon, PVC, polystyrene, etc. False. ... State whether the following statements are True or False: Question 1. Answer: True. 17.Which kinds of materials are used in civil structures? b. True. Once formed, it can be heated and reformed over and over again A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021. (a) Polymer viscosity increases as .Polymer molecular weight increases (b) Adding a good solvent can reduce polymer viscosity (c) Polymer viscosity decreases as temperature decreases (d) Coating viscosity begins to increase after application, as the solvent begins to evaporate. a) A branched polymer will have more ductility than a cross-linked polymer (True or False) b) Unlike metals, most thermoplastic polymers are not fully crystalline. False. (b) Thermosets cannot be reshaped. Indicate whether each statement is true or false:(a) Elastomers are rubbery solids. (e) Assertion is false but Reason is correct. Thermoplastic = can be melted and re-formed. HIPS ? Nylon was also known as artificial silk in China. All fibres are made up of very large units which in turn are made up of many small units. It is a runny liquid that can be processed to make latex gloves, erasers, and party balloons. (a) natural polymer (b) semi-synthetic polymer (c) synthetic polymer (d) plasticiser. 2. Such as low density polythene. FALSE; Which of the following is commonly used in schools for vacuum forming? The polymer melmac is obtained by 1) Addition polymerization of melamine and formaldehyde 2) Condensation of polymerization of melamine and formaldehyde 3) Coordination polymerization of melamine 4) Free-radical polymerization of tetrafluroethylene 52. ? A polymer of prop-2-enenitrile is called 1) Saran 2) Orlon 3) Dacron 4) Teflon 51. A. Plastic is suitable for building large and heavy structures. TRUE ? B epoxy C. C melamine. Polyethylene, or PE, is a polymer composed of chains of ethylene units.... See full answer below. No. true or false In an addition polymerization reaction the polymer is the sole product true or false Thermoplastic polymers may be converted into thermosetting polymers. NCERT Class 12 Chemistry Exemplar for Chapter 15 Polymers provide you polymer questions multiple choice, polymer MCQ for NEET, Fill in the blanks, Match the following, True or False, Worksheets, polymers Class 12 important questions, exercises and assignments. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Class 8 Science Chapter 3 MCQ (Multiple Choice Questions) of Synthetic Fibres and Plastic. ... Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. All polymers made from polyethylene will have the same density. (i) Linear polymer: These polymers consist of long and straight chains. True. Nylon is a thermoplastic silky material [1] that can be melt-processed into fibers, films, or shapes. Melamine / ˈ m ɛ l ə m iː n / is an organic compound with the formula C 3 H 6 N 6.This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. Which of the following statements is false? Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. FALSE; PVC is a thermoplastic. Question 46. while nylon-6,6 is a polyamide which is commonly known as fibre. ? (c) Thermoplastic polymers can … Small molecules that make up larger molecules. The repeat unit in natural rubber is isoprene. A polymer plastic which cures irreversibly is called a thermosetting plastic. (ii) Cross-linked polymers: These are formed from bi- functional and tri- functional monomers. Long Answer Type Questions Question. Such as polythene, polyvinyl chloride etc. The key difference between polymers and plastics is that plastic is a specific type of polymer. FALSE. A good example of a thermosetting polymer is vulcanized rubber. Which one of the following is not a condensation polymer? a. TRUE ? There are many types, varying from very slow to very fast curing. b. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. (a) Rayon (b) Polymer (c) Terylene (d) Plastic (e) Polyester (f) Teflon. Assertion (A): Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric. [2]:2 It is made of repeating units linked by amide links [3] similar to the peptide bonds in proteins. Answer/Explanation. ? a. Elastomer = possesses elasticity. High-density polyethylene or HDPE is a thermoplastic polymer used in the production of plastic bottles, containers, corrosion-resistant pipes, etc. The present strategy of the company is to become a reliable global multiproduct player able to offer a wide range of effective flame retardants, based on different […] A true B. B. D. D Bakelite. b. Commercially ... Melamine is a versatile material which resists the spread of fire. Novolac, a condensation polymer of phenol and formaldehyde is a thermosetting polymer. b. Polyester. TRUE ? Melamine plastic or melamine formaldehyde is a hard, thermoset plastic material made from melamine and formaldehyde by polymerization. [CBSE AIPMT 2012] A. ... Rubber is a linear polymer. Synthetic fibre do not melt on heating. 23. False. 7 Which of the following is the chemically inert to organic solvents? A true B. The key difference between thermoplastic and thermoset is that thermoplastic can be melted into any shape and re-used whereas thermosets have a permanent shape and cannot be recycled into new forms of plastic.. Thermoplastic and thermoset are terms we use to characterize polymers depending on their behaviour when subjected to heat, hence the prefix, ‘thermo’. Like polypropylene, polyethylene is a _____ thermoplastic polymer, which means it becomes pliable and moldable above a specific temperature and can be remolded multiple times. a. B. Neoprene. The fabric tery wool is obtained by mixing terylene and wool. State whether the statements given below are True or False’. Strong heat causes these polymers to discolor and decompose. True. When small amounts of noxious material is added to ethanol, it becomes unfit for drinking and is known as natured alcohol. a. PVC. ... Thermoplastic polymer _____ _____ harden permanently when formed and cannot be softened by head and remolded. (True or False) c) Most polymers used in 3D printing applications are thermoplastic (True or False) It is risky to wear synthetic clothes while working in the kitchen. 5) HDPE is a tough plastic used for making toys. b. True or False: Celluloid was used for billiard balls, men's fashion collars, and movie film. Die Schwerpunkte der Forschung liegen auf … 4) PVC is a thermoplastic. While each has its own set of pros and cons, what ultimately determines which material is best suited to any given application comes down to a number of factors that may include any or all of the following: strength, durability, flexibility, ease/expense of manufacture, and recyclability. Play this game to review Chemical Bonds. C. Melamine. True or False? A acrylic B. Rayon is (a) natural silk (b) artificial silk (c) natural rubber (d) synthetic plastic. 6. Advances in thermoset and thermoplastic technology are ongoing and there's definitely a place for both. Italmatch Chemicals manufacture and develop Phosphorus and Nitrogen based Flame Retardant Additive in many polymer applications, mainly for thermoplastic polymers but also for thermoset and carpet backing applications. On the opposite of that Thermosetting doesn't regain its shape after heating. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) 14. Neoprene rubber are thermoplastic polymers. False. Question 6. (ii) Branched chain polymers: These polymers contain linear chains having some branches. Melamine (MF) ? Semi Crystalline PE is a family member of a broader group known as _______________; which also includes Polypropylene. Rubber tapped from para rubber trees is a polymer of isoprene monomers. Polyester fibres are used for making hand knit sweaters. (d) Assertion is correct but Reason is false. Plastics are comprised of a long chain of polymers, where polymers are composed of smaller, uniform molecules. 25 State whether the following statements are True/False. melamine polymer thermoset thermoplastic mole percent Prior art date 1999-09-29 Legal status (The legal status is an assumption and is not a legal conclusion. Volker Altstädt stehen im Brand "Polymer Engineering" drei kompetente Institutionen zusammen: der Lehrstuhl Polymere Werkstoffe der Universität Bayreuth, der Geschäftsbereich Kunststoffe der Neue Materialien Bayreuth GmbH und die Abteilung Polymer Engineering der TuTech Innovation GmbH in Hamburg. Question 2. 50. 1. Question 7. The assertion is true but the reason is false. Unter der Leitung von Prof. Dr.-Ing. R ): Rayon is a thermoplastic silky material [ 1 ] that be... Was used for making toys to each other by chemical bonds is called 1 ) Saran 2 ) 3... Forms, or used as an adhesive from very slow to very fast curing silky material [ 1 that! 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Tery wool is obtained by mixing Terylene and wool ]:2 it is risky to wear clothes!

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